Effects of conductivity in electric-field-induced aggregation in electrorheological fluids

1995 ◽  
Vol 52 (2) ◽  
pp. 1669-1693 ◽  
Author(s):  
Boris Khusid ◽  
Andreas Acrivos
Keyword(s):  
Electric Field ◽  
Electrorheological Fluids ◽  
Induced Aggregation

PHASE SEPARATION AND TURBIDITY OF ELECTRORHEOLOGICAL FLUIDS

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3093-3101 ◽  
Author(s):  
S. CUTILLAS ◽  
A. MEUNIER ◽  
E. LEMAIRE ◽  
G. BOSSIS ◽  
J. PERSELLO
Keyword(s):  
Electric Field ◽  
Silicone Oil ◽  
Average Length ◽  
Coupling Parameter ◽  
Electrorheological Fluids ◽  
Electrostatic Energy ◽  
Theoretical Interpretation ◽  
Debye Theory ◽  
Induced Aggregation ◽  
Kinetics Of

The turbidity of a suspension of silica particles in a silicone oil is studied in the presence of an electric field. We present experimental results which show a very strong attenuation of a laser beam when the electric field is switched on. We give a theoretical interpretation of these results with the help of a Rayleigh Gans Debye theory applied to cylinders. This model allows us to obtain the average length of the aggregates as a function of the coupling parameter λ, which is me ratio of the electrostatic energy to kT. These results agree with a theoretical prediction and also with the results of Monte-Carlo simulations. The kinetics of the beginning of field induced aggregation can be obtained from the change of the turbidity with time after the application of a voltage step.

Polyzwitterionic aqueous solutions – a new class of electrorheological fluids

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
George S. Georgiev ◽  
Anna A. Tzoneva ◽  
Velin A. Spassov
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Aqueous Solutions ◽  
Structural Organization ◽  
Cluster Formation ◽  
Electrorheological Fluids ◽  
Core Shell ◽  
New Class ◽  
Polyelectrolyte Solutions ◽  
Direction Opposite

AbstractIt has been established that the electroviscosity effect of polyzwitterionic (PZI) aqueous solutions is more considerable than and acts in a direction opposite to that of aqueous polyelectrolyte solutions. Temperature and electric field strength influence the electroviscosity of PZI aqueous solutions in parallel, though the reasons for these effects are quite different. The unusual electroviscosity behaviour of PZI solutions is explained by a ‘core-shell’ model for the structural organization of PZI macromolecules, suggesting that cluster formation is due to intensive dipoledipole interactions between monomer units of the same or of different macromolecules.

scholarly journals Microconvection heat transfer in electrorheological fluids in rotating electric field

2013 ◽  
Vol 412 ◽  
pp. 012008
Author(s):  
A A Mokeev ◽  
S A Gubarev ◽  
E V Korobko ◽  
N A Bedik
Keyword(s):  
Heat Transfer ◽  
Electric Field ◽  
Electrorheological Fluids

Water-Activated Bacterial Cellulose-Based Electrorheological Fluids and Electromechanical Response of Artificial Muscle Based on Electrorheological Fluids and Siloxane Gel

2009 ◽  
Vol 87-88 ◽  
pp. 143-148
Author(s):  
Nai Xu ◽  
De Min Jia
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Water Content ◽  
Bacterial Cellulose ◽  
Yield Stress ◽  
Particle Concentration ◽  
Electrorheological Fluids ◽  
Water Yield ◽  
Composite Gel

Electrorheological (ER) characteristics of ER fluids (ERF) containing bacterial cellulose (BC) particles in silicone oil was investigated as a function of particle water content, DC electric field strength and particle concentration. It was found that the existence of water in BC particles strongly influenced the performance of water-activated ERF based on BC particles. Around 8.8 wt% water, yield stress reached its maximum valve of 1118 Pa after which it decreased with increasing water content. At the same water content, yield stress increased linearly with increasing in either electric field strength or particle concentration. The ERF based on BC particles was introduced into the poly (dimethylsiloxane) (PDMS) gels to prepare electric field sensitive composite gel. Electric fields were applied to these composite gels using flexible electrodes. Compressions of these gels with varying PDMS/ERF ratios were confirmed by the electrode displacement. It was found that 50/50 PDMS/ERF gel exhibited the maximum displacement of 102um at 2 kV/mm electric field.

Frequency dependence of electrorheological fluids in an ac electric field

1995 ◽  
Vol 52 (6) ◽  
pp. 6329-6332 ◽  
Author(s):  
Kunquan Lu ◽  
Weijia Wen ◽  
Chenxi Li ◽  
Sishen Xie
Keyword(s):  
Electric Field ◽  
Frequency Dependence ◽  
Electrorheological Fluids ◽  
Ac Electric Field
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